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@article{1538396,
author = {Králík, Miroslav and Hupková, Adela and Zeman, Tomáš and Hložek, Martin and Hlaváček, Lukáš and Slováčková, Marie and Čuta, Martin and Urbanová, Petra},
article_location = {Hoboken},
article_number = {4},
doi = {http://dx.doi.org/10.1002/ajhb.23260},
keywords = {siblings; birth order; interbirth interval; 2D:4D ratio; prenatal programming},
language = {eng},
issn = {1042-0533},
journal = {American Journal of Human Biology},
title = {Family effects on the digit ratio (2D:4D): The role of the interbirth interval},
url = {https://doi.org/10.1002/ajhb.23260},
volume = {31},
year = {2019}
}
TY - JOUR
ID - 1538396
AU - Králík, Miroslav - Hupková, Adela - Zeman, Tomáš - Hložek, Martin - Hlaváček, Lukáš - Slováčková, Marie - Čuta, Martin - Urbanová, Petra
PY - 2019
TI - Family effects on the digit ratio (2D:4D): The role of the interbirth interval
JF - American Journal of Human Biology
VL - 31
IS - 4
SP - 1-19
EP - 1-19
PB - Wiley
SN - 10420533
KW - siblings
KW - birth order
KW - interbirth interval
KW - 2D:4D ratio
KW - prenatal programming
UR - https://doi.org/10.1002/ajhb.23260
L2 - https://doi.org/10.1002/ajhb.23260
N2 - Objectives Family represents the closest social environment that immediately affects human ontogeny from an early prenatal period. This study aimed to assess sibship influences on the second-to-fourth digit length ratio (2D:4D ratio). Methods The source sample represented 329 children aged 6.5 to 15.8 years (Czech Republic), including a subsample of 75 sibling pairs. A combination of (a) between-family design (cross-sectional sample) and (b) within-family design (pairs of siblings) was used to study the effect of family variables and interbirth interval (IBI) on the 2D:4D ratio. Results Birth order, number of siblings (except for younger sisters), and sex ratio in siblings were significantly related to the 2D:4D ratio on the right, left, or both hands. At the same time, the relationships were opposite in males and females for birth order, number of older brothers and number of children in the family-increasing values in these variables increased digit ratio in males but decreased digit ratio in females. Mean difference in 2D:4D ratio (DIFF) within pairs (older minus younger sibling) differed from zero only in the “older sister-younger brother” group, where DIFF did not depend on IBI. On the contrary, in remaining pair types the DIFF tended to change with IBI, the strongest in the “older brother-younger sister” pairs. Conclusions Family variables, especially number of older brothers, should be considered as important confounding factors in 2D:4D ratio studies. However, the effect of these variables might be modified by IBI.
ER -
KRÁLÍK, Miroslav, Adela HUPKOVÁ, Tomáš ZEMAN, Martin HLOŽEK, Lukáš HLAVÁČEK, Marie SLOVÁČKOVÁ, Martin ČUTA and Petra URBANOVÁ. Family effects on the digit ratio (2D:4D): The role of the interbirth interval. \textit{American Journal of Human Biology}. Hoboken: Wiley, 2019, vol.~31, No~4, p.~1-19. ISSN~1042-0533. doi:10.1002/ajhb.23260.
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